Analysis of the neutralino system in three–body leptonic decays of neutralinos

Choi, Seong Youl; Chung, Bub Dong; Kalinowski, J.; Kim, Y.G.; Rolbiecki, Krzysztof

doi:10.1140/epjc/s2006-02482-1

Cited by 33 publications

(25 citation statements)

References 25 publications

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“…This is due to CP invariance which requires different intrinsic parities for the χ 0 2 χ 0 1 pair in case they are higgsino-like or gaugino-like [39][40][41][42][43]. This allows, in principle, for testing the prediction of lopsided gauge mediation of a light higgsino-like neutralino.…”

Section: Jhep05(2011)112mentioning

confidence: 99%

“…However, we have to remark that, differently from the case studied in refs. [39][40][41][42][43], lopsided gauge mediation does not benefit from a copious source of moderately boosted χ 0 2 from the decay chains of the colored sparticles, and therefore the leptons relevant for this analysis have p T ∼ m χ 0 2 − m χ 0 1 ∼ 10 GeV which makes them detectable but rather soft. A quantitative assessment of the potential of the LHC to measure the details of the invariant mass distribution of such soft leptons would be needed before concluding that the higgsino nature of the light neutralinos of lopsided gauge mediation can be tested at the LHC.…”

Section: Jhep05(2011)112mentioning

confidence: 99%

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Lopsided gauge mediation

Simone

Franceschini

Giudice

et al. 2011

J. High Energ. Phys.

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It has been recently pointed out that the unavoidable tuning among supersymmetric parameters required to raise the Higgs boson mass beyond its experimental limit opens up new avenues for dealing with the so called µ-B µ problem of gauge mediation. In fact, it allows for accommodating, with no further parameter tuning, large values of B µ and of the other Higgs-sector soft masses, as predicted in models where both µ and B µ are generated at one-loop order. This class of models, called Lopsided Gauge Mediation, offers an interesting alternative to conventional gauge mediation and is characterized by a strikingly different phenomenology, with light higgsinos, very large Higgs pseudoscalar mass, and moderately light sleptons. We discuss general parametric relations involving the fine-tuning of the model and various observables such as the chargino mass and the value of tan β. We build an explicit model and we study the constraints coming from LEP and Tevatron. We show that in spite of new interactions between the Higgs and the messenger superfields, the theory can remain perturbative up to very large scales, thus retaining gauge coupling unification.

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Section: Jhep05(2011)112mentioning

confidence: 99%

Section: Jhep05(2011)112mentioning

confidence: 99%

Lopsided gauge mediation

Simone

Franceschini

Giudice

et al. 2011

J. High Energ. Phys.

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show abstract

“…In particular, we find that the behavior of the M ll distribution near the endpoint is completely different between the two cases of ÿ1 and 1. This can be understood in terms of the selection rule for the orbital angular momentum due to the CP properties of the two neutralinos 0 1 and 0 2 [57]. For 1 ( ÿ 1), the M ll distribution near the kinematical endpoint, which corresponds to the limit of slow moving 0 1 in the 0 2 rest frame, should give an S-wave (P-wave) behavior, leading to M ll / m ÿ M ll 1=2 (M ll / m ÿ M ll 3=2 ) near the endpoint.…”

Section: Higgsino Lsp At the Lhcmentioning

confidence: 99%

Supersymmetry, naturalness, and signatures at the CERN LHC

2006

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Weak scale supersymmetry is often said to be fine-tuned, especially if the matter content is minimal. This is not true if there is a large A term for the top squarks. We present a systematic study on fine-tuning in minimal supersymmetric theories and identify low-energy spectra that do not lead to severe fine-tuning. Characteristic features of these spectra are: a large A term for the top squarks, small top squark masses, moderately large tan, and a small parameter. There are classes of theories leading to these features, which are discussed. In one class, which allows a complete elimination of fine-tuning, the Higgsinos are the lightest among all the superpartners of the standard model particles, leading to three nearly degenerate neutralino/chargino states. This gives interesting signals at the LHC-the dilepton invariant mass distribution has a very small endpoint and shows a particular shape determined by the Higgsino nature of the two lightest neutralinos. We demonstrate that these signals are indeed useful in realistic analyses by performing Monte Carlo simulations, including detector simulations and background estimations. We also present a method that allows the determination of all the relevant superparticle masses without using input from particular models, despite the limited kinematical information due to short cascades. This allows us to test various possible models, which is demonstrated in the case of a model with mixed moduli-anomaly mediation. We also give a simple derivation of special renormalization group properties associated with moduli mediated supersymmetry-breaking, which are relevant in a model without fine-tuning.

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“…Fig. 7(d) shows the dependence of the CP-odd asymmetry on the phase Φ 1 of the Bino mass parameter M 1 [55].…”

Section: Supersymmetry At Collidersmentioning

confidence: 99%

Supersymmetry

Kalinowski¹

2011

Proceedings of Third Linear Collider Physics School 2009 — PoS(LCPS2009)

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These lecture notes give an introduction to supersymmetry and its phenomenology at colliders. In the first lecture, after motivating, we discuss supersymmetry formalism and the construction of supersymmetric Lagrangian with scalars, fermions and gauge bosons. The second lecture covers the structure of the Minimal Supersymmetric Standard Model (MSSM). Current experimental limits and the prospects of measurements of MSSM parameters at the LHC are briefly reviewed. Assuming that the LHC finds signals of SUSY, in the last lecture we discuss the exploration of supersymmetry at future Linear Colliders with the ultimate goal of reconstructing the fundamental theory. Third Linear Collider Physics School

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Analysis of the neutralino system in three–body leptonic decays of neutralinos

Cited by 33 publications

References 25 publications

Lopsided gauge mediation

Lopsided gauge mediation

Supersymmetry, naturalness, and signatures at the CERN LHC

Supersymmetry

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